Subaru Impreza 2003 Service Manual page 3117

7. CHECK KEY WARNING SWITCH
Step
1 CHECK FUSE.
Remove and visually check the fuse No. 6 (in
the main fuse box).
2 CHECK KEY WARNING SWITCH CIRCUIT.
1)Disconnect the keyless entry control module
harness connector.
2)Insert the key into ignition switch. (LOCK
position)
3)Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
(B176) No. 1 (+) — Chassis ground (–):
3 CHECK KEY WARNING SWITCH CIRCUIT.
1)Remove the key from ignition switch.
2)Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
(B176) No. 1 (+) — Chassis ground (–):
4 CHECK KEY WARNING SWITCH.
1)Disconnect the key warning switch harness
connector.
2)Insert the key into ignition switch. (LOCK
position)
3)Measure the resistance between key warn-
ing switch terminals.
Terminal
No. 1 — No. 2:
5 CHECK KEY WARNING SWITCH.
1)Remove the key from ignition switch.
2)Measure the resistance between key warn-
ing switch terminals.
Terminal
No. 1 — No. 2:
KEYLESS ENTRY SYSTEM
Is the fuse blown out?
Is the voltage more than 10 V? Go to step 3.
Is the voltage 0 V?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
SL-19
Check
Replace the fuse
with a new one.
The key warning
switch is OK.
Go to step 5.
Check the follow-
ing:
• Harness for
open circuits or
shorts between
the key warning
switch and fuse
• Harness for
open circuits and
shorts between
the keyless entry
control module
and key warning
switch
SECURITY AND LOCKS
Yes No
Go to step 2.
Go to step 4.
Go to step 4.
Replace the key
warning switch.
Replace the key
warning switch.